Continuity: When Andy is sitting in the restaurant with her father, you see her father taking of his glasses. In the next shot you see the father from the back, taking of his glasses again.
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Mistakes
At the very end of the film, after Miranda has sat down in her car and told the driver to "go"; it doesn't look like she's actually in it in the next shot when the car takes off as Andy walks by. See more...
The Devil Wears Prada mistakes
Continuity: This one has to be watched carefully but can be seen without slow motion - when Emily hits the taxi's windshield, the front shot shows her hit the hood with an orange package under her - it looks more like a box than a bag - and her purse in her right hand. Before she was hit she also had a small orange bag in her hand. A shot later, the side view of the accident shows 3 orange bags flying through the air, and her purse is on her left arm, not on the right as it should be.
Continuity: At the very end of the film, after Miranda has sat down in her car and told the driver to "go"; it doesn't look like she's actually in it in the next shot when the car takes off as Andy walks by.